1. If I Had a Hammer
Description: Build a lumbermill (Single Player)
Gamerscore Worth: 5G
How to Earn: Simply progress through the single player mode and you'll be prompted to build a lumbermill, do so and this will unlock.

2. Siegfried (or Roy)
Description: Train a Kefling (Single Player)
Gamerscore Worth: 5G
How to Earn: Another simple achievement that you almost have to get. Simply pick up a Kefling and drop him (or her) on a resource, i.e. Rock Quarry, Forest. The achievement will unlock shortly thereafter.

3. Frank Lloyd
Description: Unlock 25 blueprints (Single Player)
Gamerscore Worth: 25G
How to Earn: This achievement will come along as you progress through the game. As you build things, they branch off to make other things. The more you build, the more bonus blue prints you will receive.

I will add a complete guide of each blueprint, what they require, and what they will unlock soon!

4. Big Bully
Description: Became the big bully of the village (Single Player)
Gamerscore Worth: 15G
How to Earn: Simply kick your Keflings (kick by standing near them and pushing X) 30 times to get this one. I suggest doing it at the very beginning of the game, as you have plenty of unoccupied Keflings to kick around.

5. Haberdasher
Description: Encounter every possible Kefling hat (Single Player)
Gamerscore Worth: 20G
How to Earn: You need to train your Keflings to do everything possible. You must at one point train the following:

Miner (Stone Quarry)

Lumberjack (Forest)

Carrier (Trained to carry goods for you)

Wool Harvester (Sheep, Sheers are found to the west of town center, embedded in a forest)

Artist (After creating an Artist's Plaza, select it and choose a color to get a Kefling with the hat)

*NOTE: Artist Hat tends to glitch. If you are positive that you have all the hats but still aren't getting that achievement, select you Artist's Plaza and a color again. This hat seems to reset after each game reboot.

6. Like Rabbits
Description: Reach a total Kefling population of 30 (Single Player)
Gamerscore Worth: 15G
How to Earn: Simply complete all the quests that your Mayor/Lord/King gives you to get love. To get quests, simply go to the Mayor/Lord/King when he has a "!" over his head and push A. You should also check the sites your workers are harvesting, as love and other upgrades are hidden under resources. Use the love to build Houses and Cottages to get your Keflings.

7. Think Big
Description: Build a building made of more than 8 pieces (Single Player)
Gamerscore Worth: 10G
How to Earn: When you view a blueprint for a building, the required parts are shown. To unlock this achievement you must build a building that requires 8 or more parts. The first blueprint available with more that 8 pieces will be the Contractor's Office. Once it's built it will unlock.

8. Master Builder
Description: Build a cathedral (Single Player)
Gamerscore Worth: 25G
How to Earn: This achievement will come relatively late in the game. As it says, you need to successfully construct a cathedral for your town. The Cathedral becomes available after You Build a Tailor, Dye Mixer Upgrade (Unlocks Manor) and a Manor.

9. King
Description: Finish a complete castle with three connected parts (Single Player)
Gamerscore Worth: 40G
How to Earn: This achievement is unlocked by making it to the end of the main blueprint list and creating a castle. The attachable parts are the Arsenal, the Chatelet, the Main Well, and the Residential Tower. Attach three of these to your castle with Castle Walls to get this achievement.

10. Friend
Description: Collect 10 unique player banners from other giants during Xbox LIVE play
Gamerscore Worth: 10G
How to Earn: When other players join your multiplayer game, they can visit the workshop and build a banner tower, this displays the players gamer picture, collect 10 unique banner towers in your multiplayer kingdom to unlock this achievement. They must be made in your kingdom. You will have to start a new kingdom. All you need to build is a House, Town Workshop, Lumbermill and a Town Hall. At this point you can make Banner Towers in the Town Workshop.

11. World Traveler
Description: Play in an online game where 20 different player banners appear
Gamerscore Worth: 10G
How to Earn: Player banners are banner towers that can be made in workshops, these display the player's gamer picture. To unlock this achievement you must be in a game in which twenty unique (different players) banner towers are built. This does not have to be your save game therefore you can simply join somebody's game that has twenty banner towers.

12. Vanity
Description: Built a glorious statue of oneself (Single Player)
Gamerscore Worth: 20G
How to Earn: This one can be unlocked once you have created a Sculptor. In the Sculptor, the bottom of the list (excluding the Stockpiles) has statues called Busts of (Somename). There are four different ones. Choose whichever one your want and build four of them. Make sure that you're making four copies of the same Bust, not four different ones. Arrange these four Busts in a square, much like the Town Square and it will form a Colossus. The achievement will then unlock.

NOTE: You will also need to have built a Wizard's Tower in order to create the Magic Powder required for building the busts.